/*
 * Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
package com.sun.max.vm.stack;

import static com.sun.max.vm.thread.VmThreadLocal.*;

import com.sun.max.unsafe.*;
import com.sun.max.vm.code.*;
import com.sun.max.vm.compiler.target.*;
import com.sun.max.vm.thread.*;

/**
 * The standard stack walker used in the VM.
 */
public final class VmStackFrameWalker extends StackFrameWalker {

    private Pointer tla;

    private boolean dumpingFatalStackTrace;

    public VmStackFrameWalker(Pointer tla) {
        super();
        this.tla = tla;
    }

    public void setTLA(Pointer tla) {
        this.tla = tla;
    }

    @Override
    public TargetMethod targetMethodFor(Pointer instructionPointer) {
        return Code.codePointerToTargetMethod(instructionPointer);
    }

    @Override
    public byte readByte(Address address, int offset) {
        return address.asPointer().readByte(offset);
    }

    @Override
    public Word readWord(Address address, int offset) {
        return address.asPointer().readWord(offset);
    }

    @Override
    public int readInt(Address address, int offset) {
        return address.asPointer().readInt(offset);
    }

    @Override
    public Pointer readPointer(VmThreadLocal tl) {
        Pointer etla = ETLA.load(tla);
        return tl.load(etla);
    }

    public boolean isDumpingFatalStackTrace() {
        return dumpingFatalStackTrace;
    }

    public void setIsDumpingFatalStackTrace(boolean flag) {
        dumpingFatalStackTrace = flag;
    }
}
